请尝试以下方式激活（2020.1.6更新）
idea激活码（亲测 idea 2019.3可用）有效期到2021年3月：
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激活码：idea 2018.3.3 （2020.1.9后可能失效）：
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idea 2018.3.2 和2019.1.2 破解
https://www.codetd.com/en/article/8432125
idea 2019.3 破解补丁和激活码（一起使用），可破解至2089年！
1.安装2019.3版的idea
2.将破解补丁放在idea安装目录的bin下面（我的是C盘）
破解补丁和激活码链接，补丁提供两份，激活码提供三份：
链接：https://pan.baidu.com/s/1dPnomimQyLfeCSS-HOp5mw
提取码：5do4
3.配置路径
加上这行：
-javaagent:C:Program FilesJetBrainsIntelliJ IDEA 2019.3injetbrains_agent_1.jar
4.重启填入激活码：
搞定！
比较牛逼的方式：通过开源项目免费申请 IntelliJ IDEA license（激活码）
链接：https://www.cnblogs.com/linliquan/p/12317606.html
idea各版本激活码：
来自评论区网友提供的链接（2020年6月5日更新）：http://idea.ibyte.vip/